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    Subject[PATCH 09/12] KVM: MMU: coalesce zapping page after mmu_sync_children
    Date
    Move the call to kvm_mmu_flush_or_zap outside the loop.

    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
    ---
    arch/x86/kvm/mmu.c | 9 ++++++---
    1 file changed, 6 insertions(+), 3 deletions(-)

    diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
    index 725316df32ec..6d47b5c43246 100644
    --- a/arch/x86/kvm/mmu.c
    +++ b/arch/x86/kvm/mmu.c
    @@ -2029,24 +2029,27 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu,
    struct mmu_page_path parents;
    struct kvm_mmu_pages pages;
    LIST_HEAD(invalid_list);
    + bool flush = false;

    while (mmu_unsync_walk(parent, &pages)) {
    bool protected = false;
    - bool flush = false;

    for_each_sp(pages, sp, parents, i)
    protected |= rmap_write_protect(vcpu, sp->gfn);

    - if (protected)
    + if (protected) {
    kvm_flush_remote_tlbs(vcpu->kvm);
    + flush = false;
    + }

    for_each_sp(pages, sp, parents, i) {
    flush |= kvm_sync_page(vcpu, sp, &invalid_list);
    mmu_pages_clear_parents(&parents);
    }
    - kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
    cond_resched_lock(&vcpu->kvm->mmu_lock);
    }
    +
    + kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
    }

    static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp)
    --
    1.8.3.1

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